I've never actually come across a book called 'This Is Me'. I searched online a few times, even checking different spelling variations, but came up empty. It might be a self-published work with a very limited reach, or perhaps the title is slightly different, like a subtitle or part of a series. Without any real details about the author or publisher, it's hard to even guess at a plot.
Could it be a mistranslation or a regional title for something more well-known? Sometimes memoirs or self-help books use similar phrases. Honestly, at this point, the main plot seems to be the mystery of the book's own existence! I'd need more to go on before I could offer any insight.